Abstract
Egg masses of the spruce budworm, Choristoneura fumiferana (Clemens), were sampled in February and March for overwintering Trichogramma minutum Riley at five locations in central Maine. Egg mass densities and the percentage of parasitized eggs were generally greater in upper- and middle-crown levels than in the lower crown of balsam fir, Abies balsamea (L.) Miller. Significantly more parasitized egg masses were “chewed” than partially parasitized or normal, eclosed egg masses. Parasitized eggs contained only cadavers of T. minutum pupae; thus, we found no evidence that this species or any other egg parasite overwinters in eggs of the spruce budworm
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